CN114485297A

CN114485297A - Tunnel blasting structure and tunnel blasting construction method

Info

Publication number: CN114485297A
Application number: CN202111587252.5A
Authority: CN
Inventors: 韦纯阳; 杨晓庆; 刘静蓉
Original assignee: Chongqing AVIC Construction Group Co Ltd
Current assignee: Chongqing AVIC Construction Group Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-05-13

Abstract

The invention relates to a tunnel blasting structure and a tunnel blasting construction method, in particular to the technical field of tunnel construction, wherein the tunnel blasting structure comprises a cut hole, an auxiliary hole and peripheral holes, the auxiliary hole and the peripheral holes are vertical grooves, a paper tube with one sealed end is paved on the inner wall of each vertical groove, a cylindrical water bag, a millisecond detonator and a cylindrical water bag are sequentially contained in the paper tube, a first air inlet pipe is contained in the inner wall of the paper tube in advance, and a millisecond detonator detonating cord extends out through the first air inlet pipe.

Description

Tunnel blasting structure and tunnel blasting construction method

Technical Field

The invention relates to the technical field of tunnel construction, in particular to a tunnel blasting structure and a tunnel blasting construction method.

Background

The tunnel excavation construction is inevitable without encountering the structures and wrinkles around an excavation line, when a tunnel excavation rock stratum is good and the structures are around, in order to ensure that the structures are not influenced, the excavation process construction method can select static blasting, hydraulic blasting, presplitting blasting, electronic detonator blasting and the like.

Disclosure of Invention

The invention aims to provide a tunnel blasting structure and a tunnel blasting construction method, which have better effect of preventing a water bag from being broken when the water bag is filled into a vertical groove from the outside.

The above object of the present invention is achieved by the following technical solutions:

the tunnel blasting structure comprises cut holes, auxiliary holes and peripheral holes, wherein the auxiliary holes and the peripheral holes are vertical grooves, a paper tube with one end sealed is laid on the inner wall of each vertical groove, a cylindrical water bag, a millisecond detonator and a cylindrical water bag are sequentially contained in the paper tube, a first air inlet pipe is contained in the inner wall of the paper tube in advance, and a millisecond detonator detonating cord extends out through the first air inlet pipe.

Preferably, the underholing hole includes first toper underholing and second toper underholing, first toper underholing and second toper underholing include outside upward the underholing to one side and outside underholing, install the support frame in the underholing to one side outside, the support frame includes a plurality of plastic rings, adopt second intake-tube connection between the plastic ring, the plastic ring both sides still are connected with the steel wire, be formed with a plurality of arrangement grooves between plastic ring and second intake pipe and the steel wire, millisecond detonator and cylindric water bag are placed respectively in the arrangement groove, the plastic ring end is provided with the mounting hole.

Preferably, the cylindrical water bag and the millisecond detonator are sequentially placed in the placement groove at intervals.

Preferably, the surface of the plastic ring is provided with a round angle.

A tunnel blasting construction method comprises the following steps:

s1, drilling the cutting hole, the auxiliary hole and the peripheral holes;

s2, mounting support frames for sequentially placing cylindrical water bags and millisecond detonators at intervals on the outwards inclined undercutting, enabling detonation wires of the millisecond detonators to extend out through a second air inlet pipe, mounting paper cylinders in the residual undercutting holes, the auxiliary holes and the peripheral holes, placing the cylindrical water bags in the paper cylinders in advance, plugging the millisecond detonators with the detonation wires extending out through the first air inlet pipe and the first air inlet pipe into the paper cylinders, and placing the cylindrical water bags in the residual spaces of the paper cylinders;

and S3, sequentially detonating the first conical cut, the second conical cut, the auxiliary hole and the peripheral hole.

In conclusion, the invention has the beneficial effects that:

when the millisecond detonator and the cylindrical water bag are placed in the vertical groove, the cylindrical water bag is difficult to cut by the protrusion in the vertical groove due to the protection of the paper tube, so that the millisecond detonator can be protected.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a paper cartridge;

FIG. 3 is a schematic structural view of the support frame;

fig. 4 is a schematic view of the structure of the undercut hole in fig. 1.

The marks in the figure are respectively 1 and a slotted hole; 11. a first conical cut; 12. second conical cut; 13. the outer oblique upper cut is made; 14. downwards cutting obliquely outwards; 2. an auxiliary eye; 3. peripheral eyes; 4. a paper tube; 41. a first intake pipe; 5. a cylindrical water bag; 6. a millisecond detonator; 7. a support frame; 71. a plastic ring; 72. a second intake pipe; 73. a steel wire; 74. and (5) placing the groove.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 4, the tunnel blasting structure comprises an undercut hole 1, an auxiliary hole 2 and peripheral holes 3, wherein the auxiliary hole 2 and the peripheral holes 3 are vertical grooves, a paper tube 4 with one end sealed is laid on the inner wall of each vertical groove, a cylindrical water bag 5, a millisecond detonator 6 and a cylindrical water bag 5 are sequentially contained in the paper tube 4, a first air inlet pipe 41 is contained in the inner wall of the paper tube 4 in advance, and a detonating cord of the millisecond detonator 6 extends out through the first air inlet pipe 41.

The working principle is as follows: when the millisecond detonator 6 and the cylindrical water bag 5 are placed in the vertical groove, the cylindrical water bag 5 is difficult to be cut by the protrusion in the vertical groove due to the protection of the paper tube 4, so that the millisecond detonator 6 can be protected.

The cutting hole 1 comprises a first conical cutting 11 and a second conical cutting 12, the first conical cutting 11 and the second conical cutting 12 comprise an outward inclined upper cutting 13 and an outward inclined lower cutting 14, a support frame 7 is installed in the outward inclined lower cutting 14, the support frame 7 comprises a plurality of plastic rings 71, the plastic rings 71 are connected through second air inlet pipes 72, steel wires 73 are further connected to two sides of each plastic ring 71, a plurality of placing grooves 74 are formed among the plastic rings 71, the second air inlet pipes 72 and the steel wires 73, the millisecond detonators 6 and the millisecond detonators 5 are respectively placed in the placing grooves 74, mounting holes are formed in the ends of the plastic rings 71, and by adopting the structure, the millisecond detonators 5 and the millisecond detonators 6 can be more easily and fixedly placed in the outward inclined lower cutting 14.

The cylindrical water bag 5 and the millisecond detonator 6 are sequentially placed in the placing groove 74 at intervals.

The surface of the plastic ring 71 is provided with a circular bead, and the plastic ring 71 can be pushed more easily when pushed into the outwards inclined undercut 14 by adopting the structure.

A tunnel blasting construction method comprises the following steps:

s1, drilling the cutting hole 1, the auxiliary holes 2 and the peripheral holes 3;

s2, mounting a support frame 7 for sequentially placing cylindrical water bags 5 and millisecond detonators 6 at intervals on the outwards inclined undercut 14, extending detonation wires of the millisecond detonators 6 through a second air inlet pipe 72, mounting paper cylinders 4 in the residual undercut holes 1, the auxiliary holes 2 and the peripheral holes 3, placing the cylindrical water bags 5 in the paper cylinders 4 in advance, plugging the millisecond detonators 6 with the detonation wires extending through the first air inlet pipe 41 and the first air inlet pipe 41 into the paper cylinders 4, and placing the cylindrical water bags 5 in the residual space of the paper cylinders 4;

s3, and then detonating the first tapered plunge cut 11, the second tapered plunge cut 12, the auxiliary eye 2 and the peripheral eye 3 in sequence.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A tunnel blasting structure which characterized in that: including undercutting hole (1), supplementary hole (2) and all round holes (3) are the vertical slot, fiber container (4) that one end was sealed have been laid to the vertical slot inner wall, hold cylindric water bag (5) and millisecond detonator (6) and cylindric water bag (5) in proper order in fiber container (4), fiber container (4) inner wall has held first intake pipe (41) in advance, millisecond detonator (6) detonating cord stretches out through first intake pipe (41).

2. The tunnel blasting structure of claim 1, wherein: the cutting hole (1) comprises a first conical cutting (11) and a second conical cutting (12), the first conical cutting (11) and the second conical cutting (12) comprise an outward inclined upper cutting (13) and an outward inclined lower cutting (14), a support frame (7) is installed in the outward inclined lower cutting (14), the support frame (7) comprises a plurality of plastic rings (71), a second air inlet pipe (72) is connected between the plastic rings (71), steel wires (73) are further connected to two sides of each plastic ring (71), a plurality of installation grooves (74) are formed between the plastic rings (71) and the second air inlet pipes (72) and the steel wires (73), millisecond detonators (6) and water bags (5) are respectively placed in the installation grooves (74), and installation holes are formed in ends of the plastic rings (71).

3. The tunnel blasting structure of claim 2, wherein: the cylindrical water bag (5) and the millisecond detonator (6) are sequentially placed in the placing groove (74) at intervals.

4. A tunnel blasting structure according to claim 3, wherein: the surface of the plastic ring (71) is provided with a circular angle.

5. The tunnel blasting construction method according to claim 4, wherein:

s1, drilling a cutting hole (1), an auxiliary hole (2) and peripheral holes (3) first;

s2, mounting a support frame (7) for sequentially placing cylindrical water bags (5) and millisecond detonators (6) at intervals on an outward inclined undercutting groove (14), extending detonation wires of the millisecond detonators (6) through a second air inlet pipe (72), mounting paper cylinders (4) in a residual cutting hole (1), an auxiliary hole (2) and peripheral holes (3), placing the cylindrical water bags (5) in the paper cylinders (4) in advance, plugging the millisecond detonators (6) extending the detonation wires through a first air inlet pipe (41) and the first air inlet pipe (41) into the paper cylinders (4), and then placing the cylindrical water bags (5) in the residual space of the paper cylinders (4);

s3, sequentially detonating the first conical cut (11), the second conical cut (12), the auxiliary hole (2) and the peripheral hole (3).